Configuration: Fix const and signedness compile warnings

Change-Id: I701559814b2aee6f84f10e612f128da40f6a51c1

CommonLibs/Configuration.cpp

@@ -56,7 +56,7 @@ static const char* createConfigTable = {
 static std::string replaceAll(const std::string input, const std::string search, const std::string replace)
 {
 	std::string output = input;
- 	int index = 0;
+	size_t index = 0;
 
 	while (true) {
 		index = output.find(search, index);

CommonLibs/ConfigurationTest.cpp

@@ -47,7 +47,7 @@ int main(int argc, char *argv[])
 
 	gConfig.setUpdateHook(purgeConfig);
 
-	char *keys[5] = {"key1", "key2", "key3", "key4", "key5"};
+	const char *keys[5] = {"key1", "key2", "key3", "key4", "key5"};
 
 	for (int i=0; i<5; i++) {
 		gConfig.set(keys[i],i);